studded tires for ice?

[atc110]

I was wondering if anyone uses or knows anything about these. I think I remember an ad in the back of dirt wheels for an ice racing wheel/tire kit. If I could get them how much better are they on the ice than normal tires?
Any info appreciated.
By the way I was thinking about putting them on a ytm175 for the winter.

[TheOlderFox]

My last 225dx had studded super swappers on it. These were the best tires I ever used. The studs were great on ice. Just make sure they are the bolt in type that way they don't fling out on you.